76f17f7703
Allow having separate GC heaps and implement coordinated marking between them; this is useful for keeping wasm and js GC heaps separated with a clear boundary.
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
/*
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* Copyright (c) 2026, Ali Mohammad Pur <ali@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/TemporaryChange.h>
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#include <LibCore/ElapsedTimer.h>
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#include <LibGC/Heap.h>
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#include <LibGC/HeapGroup.h>
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namespace GC {
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HeapGroup::~HeapGroup()
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{
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for (auto* heap : m_heaps)
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heap->m_group = nullptr;
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}
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void HeapGroup::add(Heap& heap)
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{
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VERIFY(!heap.m_group);
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heap.m_group = this;
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m_heaps.append(&heap);
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}
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void HeapGroup::remove(Heap& heap)
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{
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VERIFY(heap.m_group == this);
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heap.m_group = nullptr;
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m_heaps.remove_first_matching([&](auto* entry) { return entry == &heap; });
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}
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void HeapGroup::collect_garbage(bool print_report)
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{
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// Defer all member heaps' collections until the last one, so that cross-heap edges are visible to the mark phase.
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for (auto* heap : m_heaps) {
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VERIFY(!heap->m_collecting_garbage);
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if (heap->m_gc_deferrals) {
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heap->m_should_gc_when_deferral_ends = true;
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return;
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}
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}
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for (auto* heap : m_heaps) {
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heap->finish_pending_incremental_sweep();
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heap->m_collecting_garbage = true;
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}
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ScopeGuard unset_collecting = [&] {
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for (auto* heap : m_heaps)
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heap->m_collecting_garbage = false;
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};
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HashMap<Cell*, HeapRoot> roots;
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for (auto* heap : m_heaps)
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heap->gather_roots(roots, nullptr, Heap::IncludeIncomingCrossHeapMembers::No);
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Heap::mark_live_cells_across(m_heaps, roots);
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for (auto* heap : m_heaps)
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heap->run_post_mark_phases(print_report);
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for (auto* heap : m_heaps) {
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Core::ElapsedTimer measurement_timer { Core::TimerType::Precise };
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measurement_timer.start();
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heap->sweep_dead_cells(print_report, measurement_timer);
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}
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}
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}
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